Sulphur dyestuff dyeing cotton yellow



Patented July 3 1928.

UNITEDOSTAITES PATENT OFFICE.

I IRWIN mama, OI GOLOGHl-DEUTZ, GEBKANY, AESIGNOB '10 GRASBELLI CORPORATION} 01 NEW YORK, N. Y.,A CORPORA'1ION OI nmmnn' DELAWARE.

SULPHUR DYEB'IUIF DYEING COTTON. YELLOW, e

ll'o Drawing. Application filed August 3, 1927, Serial No. 210,481, and in Germany Auguat 17, 1926.

The present invention relates to new sulphur dyestufl's, more particularly to the dyestuffs which are obtainable by heating 3-nitroor 'fi-amino-l-acetyltoluidlne of the formula:

Nn.oo.on..

in the presence of 28 molsbenzidine. Iv prefer to use temperatures of about 180-200 C. The quantity of S111 hur to be added may vary in w1de limits. v refer-ably M parts by weight of sulphurshould be added in proportion to one part by weight of the mixture from acetyltoluidme compound and the benzidine.

new dyestuffs dye cotton a clear greenish s ade of an excellent fastness to boiling. The following example will illustrate our invention, all parts being by weight:

Ewample. f

8.5 arts 3-amino-4-acetylto1uidine, 47.5

arts enzidine and 112 parts sulphur are obtained.

I claim: v 1. As new products the sulphur dyestufis which are obtainable by of the general formula:

CHI

heatinga compound group at an-elevated temperature with sulphur the presence of 2-8 mols benzidine and whlch dye cotton from baths containing sodium-sulphide yellowish brown shades passing on steaming, drying or acidifying into clear greenish ellow.

2. As a new pr not the sulphur dyestufl' which is obtainable by heating 3-amino-4- acetyltoluidine at a temperature from about 180 to 260C. with sulphur in the presence of 2-8 mols benzidine and whichdyes cotton from baths containing sodium sulphide yellowish brown shades passing on steamin drying 'or acidifying into clear greenisli yellow.

3. The process for preparing new sulphur dyestuffs which consists in heating compounds of the general formula:

mrooom. wherein X stands for a nitroor aminogroup ,at,an elevated temperature with sul-' phur inthe presence of 28-mols benzidine.

4. The" process/for preparing a new sulphur 'dyestulf which consists in heating 3- amino-acetyltoluidine to a temperature of about to. 260- C. with sulphur in the presence of 2-8 mols' benzidine.

In testimony whereof -I have hereunto .set

my hand.

' ERWIN KRAMER. 

